Fluke 5220A Bedienungsanleitung Seite 37
- Seite / 138
- Inhaltsverzeichnis
- FEHLERBEHEBUNG
- LESEZEICHEN
Bewertet. / 5. Basierend auf Kundenbewertungen
Theory of Operation
Circuit Analysis
3
3-9
3-10. A7 Output
The A7 Output is a discrete-component, complementary-output, high-current amplifier
which serves as the final output stage of the transconductance amplifier. See Figure 3-6.
It consists of a pair of driver transistors, Q101 and Q102; two parallel pair(s) of output
transistors, Q103, Q104 and Q105, Q106; a thermal sensing transistor, Q107; and a
thermal overload switch S101. The differential output from the A6 Driver is applied to
the bases of Q101 and Q102. These transistors are configured as emitter followers and
provide the high current drive required by the output transistors. Collector resistors, R114
and R115, for Q101 and Q102 provide current limit protection under transient or fault
conditions. Emitter resistors in the parallel output pairs prevent current hogging which
would otherwise occur due to unequal VBE characteristics.
ajs11f.wmf
Figure 3-6. A7 Output Functional Block Diagram
All transistors in the A7 Output as well as the thermostatic switch, S101, are physically
mounted on a common heat sink. The temperature of the heat sink is sensed by Q107
(part of the A7 Driver’s bias network) and returned to the A7 Driver to provide bias
compensation for the change in VBE with output-transistor temperature. (See A7 Driver
description given earlier in this section of the manual.) Thermostatic switch S101 senses
the temperature of the heat sink and provides an open contact output when an over-
temperature condition is detected. The open output is sent to the A10 Logic which reacts
by switching the 5220A to standby (over temperature may result from a loss or restriction
of cooling airflow).
- Instruction Manual 1
- Table of Contents 3
- List of Tables 7
- List of Figures 9
- Contents 11
- Section 1 13
- 1-2. Specifications 14
- Specifications 15
- Operating Instructions 19
- 2-4. Fuse Replacement 20
- 2-7. Rack Installation 20
- 2-8. Operating Features 20
- Operating Features 21
- 2-9. Operating Notes 23
- 2-15. Standby/Operate 24
- 2-16. Local/Remote 24
- 2-17. Status Indicators 24
- 2-18. Audible Output 25
- 2-19. Inductive Loads 25
- 2-20. Operation 27
- Theory of Operation 29
- 3-6. Circuit Analysis 32
- Circuit Analysis 33
- 3-8. Preamplifier 34
- 3-9. A6 Driver 35
- 3-10. A7 Output 37
- 3-11. A8 Analog Control 38
- 3-12. A9 Front Panel 39
- 3-13. A10 Logic 39
- 3-14. Reset Logic 39
- 3-15. Timing Logic 41
- 3-16. Standby/Operate Logic 42
- 3-17. Local/Remote Logic 43
- 3-18. Front/Rear Input Logic 43
- 3-19. Failure Status Logic 44
- 3-20. A11 MIS Bus Interface 44
- BCO, BC2 45
- BCO, BC3, BC6 45
- WWarning 47
- Maintenance 49
- General Maintenance 49
- 4-8. Front Panel Removal 50
- 4-12. A3 Cap Bus Removal 51
- 4-14. Fuse Replacement 52
- 4-15. Ac Line Fuse 52
- 4-16. Power Supply Fuses 52
- 4-17. Line Voltage Selection 52
- 4-20. Performance Test 54
- 4-22. Front Panel Tests 55
- 4-23. Zero Output 55
- 4-25. Harmonic Distortion 56
- 4-26. Frequency Response 57
- 4-27. Overcurrent Trip Test 57
- 4-29. Calibration Adjustments 58
- 4-30. Initial Conditions 59
- 4-33. Output Bias Adjustment 60
- 4-34. DC Accuracy Adjustment 60
- 4-35. Frequency Response 60
- 4-36. Overcurrent Adjustment 61
- 4-37. Overvoltage Adjustment 61
- 4-39. Resistors R11 and R12 62
- 4-40. Resistor R13 63
- 4-41. Troubleshooting 64
- Troubleshooting 65
- W Warning 74
- List of Replaceable Parts 101
- Service Centers 101
- Section 6 115
- Accessories 117
- Schematic Diagrams 119
- 5220A-1001 (Sheet 1 of 2) 120
RCA 25211 Handbücher
Bedienungsanleitungen und Benutzerhandbücher für Kopfhörer RCA 25211.
Wir stellen 1 PDF-Handbücher RCA 25211 zum kostenlosen herunterladen nach Dokumenttypen zur Verfügung Bedienerhandbuch
Kommentare zu diesen Handbüchern